Help keep your freshwater or saltwater aquarium in tip-top condition with Fluval’s Spec Biomax Filter Media. One of the most important ways to maintain good water quality and keep your fish thriving is filling your aquarium with good bacteria. This filter media is specifically designed for Fluval Spec Desktop Aquariums and provides critical stage three biological filtration. The large surface area offers healthy bacteria， which helps remove fish waste to create a cleaner and healthier environment for your underwater friends.